Addington and his manager talk about showing Zarno the "Under the Sun" sticker idea to make money. Trouble is he would already be getting royalties from it. Two scenes earlier, April May meets up with Add wearing an "Under the Sun" T-shirt. Therefore he was already making money and didn't need to go see Zarno.
In the scene where Add gets to the beach and goes to the payphone, there's a "j.k. living" sticker on the payphone glass, which is the name of the production company that is owned by Mcconaughey. (Stands for Just Keep Living.)